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second-in-command (EN)
sustantivo

sustantivo “second-in-command”

sing. second-in-command, pl. seconds-in-command
  1. segundo al mando (en el ámbito militar)
    The major served as the second-in-command to the colonel in the battalion.
  2. segundo al mando (en una organización)
    He was appointed as the company's second-in-command to assist the president with daily operations.